DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Volcanic breccia. A breccia is a rock with fragments of one material cemented within a matrix of a different material. In this case, the fragments are wood and plant remains, which probably became embedded within ash or lava during a volcanic eruption. The remains were fossilised and pressure and heat solidified the rock into this dense structure. This polished sample measures 110 millimetres across.
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